JPS6013609Y2 - Vibration device for concrete block forming machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a form vibrating device for a concrete block drilling machine.

As an example of the conventional formwork vibration device is shown in FIG. 1, a rubber-like elastic body 3 is fixed to the upper end of a pedestal 2 that can be raised and lowered by a fluid cylinder 1, and a plain pallet 4,
Further, a mold 5 is placed on each of the molds 5, and a rotary shaft 7 on both sides of which a centrifugal weight 6 for vertically vibrating the mold 5 is fixed is rotatably supported. has been,
The rotating shaft 7 is provided with a vibration generating device 10 which is driven by an electric motor 8 via a suitable transmission means 9 such as a pulley or a belt.

To mold a concrete block using such a device, first, as shown in the figure, the piston of the fluid cylinder 1 is raised, and the plain pallet 4 and formwork 5 are held from below by the pedestal 2 via the rubber-like elastic body 3. In this state, the material is supplied into the formwork 5 by a material supply device (not shown), and the vibration device 10 is operated to apply vertical vibration to the formwork 5, thereby filling the formwork.

After feeding the material in this manner, the press plate 11 is lowered while continuing to apply vibration to the formwork 5 to perform compressing.

After the forming is completed, the press plate 11 and the plain pallet 4 are lowered while maintaining the distance between them.

That is, the press plate 11 and the piston of the fluid cylinder 1 are simultaneously lowered at the same speed.

At this time, the formwork 5 is stopped by a receiver 13 provided on the frame 12 so that it does not descend any further downward, and the concrete blocks on the plain pallet 4 are removed from the formwork 5 and taken out below.

In the example shown in FIG. 2, in order to make the repulsive force of the rubber-like elastic body 3 that supports the lower surface of the plain pallet 4 sufficiently large, an air spring 15 is attached to the metal fitting 14 protruding from the frame 12. The formwork 5 is held down downward.

All other details are the same as in FIG.

The device shown by the two-dot chain line connects compressed air from a compressor (not shown) to an air reservoir 17 whose pressure is regulated to a constant pressure by a pressure regulating valve 16 through a pipe 18. By changing the settings, the spring characteristics of the air spring 15 can be changed.

Incidentally, it is inevitable that the amount of concrete material filled into the formwork 5, as well as its viscosity, varies to some extent each time.

For this reason, during compression molding, the reaction force applied to the press plate 11 and the compressive force of the rubber-like elastic body 3 that opposes this also vary within a certain range each time.

However, the tolerance for product height is 0.
It is not uncommon for a rate within 5% to be requested.

Under these circumstances, in order to improve the adhesion and followability of the plain pallet 4 to the formwork 5, it is desirable that the spring constant of the rubber-like elastic body 3 is low. For this purpose, it is desirable that the spring constant of the rubber-like elastic body 3 be high so that the change in strain amount is as small as possible.

The above-mentioned contradictory requirements cannot be achieved with the configurations shown in FIGS. 1 and 2.

In addition, an air spring was newly installed between a pallet support base having a rubber-like elastic body formed on the upper surface and a frame for raising and lowering the pallet support base (see Japanese Patent Application Laid-open No. 53-22518). Even if the spring constant of the air spring is changed, when such a rubber-like elastic body and an air spring are stacked in the load direction, the combined property is that the shrinkage of each is added, and the resistance force - shrinkage The curve becomes curved, and even if a rubber-like elastic body whose resistance force curve is gradually increasing in stiffness is used, the overall characteristics are completely destroyed.

In other words, if it is pushed, it will contract at a large rate, and the spring constant cannot be changed widely with the same air spring, so the amount of deformation of the air spring due to compression load will directly affect the product height dimension, resulting in error. has a major drawback.

The purpose of the present invention is to solve the above-mentioned technical problem, and as shown in FIG. 15' and the upper air spring 15
and the lower air spring 15' are each connected to an air pressure supply pipe that allows air pressure to be controlled separately.

There are various types of air springs 15', such as bellows type, diaphragm type, and combined type, but the preferred type for the present invention is one in which the rubber membrane only expands and contracts in a bellows-like manner during the stroke and does not reverse. A non-inverting bellows type is better.

In general, the air spring 15' has a soft spring characteristic that absorbs a lot of energy by utilizing the increase in pressure due to polytropic changes when air is compressed and the change in the pressure-receiving area of the comb. , which has an advantage not available with metal springs, where lowering the spring constant also reduces absorbed energy.

Also, when changing molds to various heights depending on the desired product, by changing the air pressure of the air spring 15' according to the load, which is the weight of the mold, the spring characteristics can be adjusted within a range regardless of the air spring 15. so that it can be changed,
Similar to the air spring 15, the air pressure piping shown in the figure is provided, and both air springs 15, 15' can each independently control the air pressure.

As described above, the present invention includes the rubber-like elastic body 3 and the air spring 15.
Since the lower surface of the pallet 4 is directly supported by the lower surface of the pallet 4, the following effects can be achieved.

That is, in response to the air spring 15 that presses down the formwork 5, the air spring 15' helps prevent the rubber-like elastic body 3 from being subjected to excessive compressive deformation. formwork 5 to the extent that linear spring characteristics can be maintained.
The adhesion and followability of the pallet 4 against vertical vibrations are not impaired.

In addition, when the rubber-like elastic body 3 and the air spring 15' are arranged side by side in the loading direction, the combined characteristics are such that their respective resistance forces are added together, and the resistance force-contraction curve becomes erect. The rubber-like elastic body 3, which has a high spring constant, covers the air spring 15', which has a low spring constant, well against the compression load during compression molding, and it is possible to keep the product height dimensional error small.

In addition, the present invention has an upper air spring 15 and a lower air spring 15.
' are connected to air pressure supply piping that allows air pressure to be controlled separately, so the air pressure in the lower air spring 15' can be released to the atmosphere immediately after the molded block is removed from the mold, which is a very simple operation. This prevents the molded block from collapsing due to pressure from above and below.

In addition, when producing concrete blocks of various shapes with a single molding machine, even if the height and weight of the mold to be replaced varies, the air pressure at the top that is optimal for that mold,
It is extremely effective in that it can be adjusted to the lower air spring pressure and can be dealt with quickly and smoothly.

[Brief explanation of drawings]

FIG. 1 shows a conventional device, FIG. 2 shows a modification thereof, and FIG. 3 shows an embodiment of the device of the present invention. 1...fluid cylinder, 2...cradle, 3
...Rubber-like elastic body, 4 ... Plain pallet, 5 ... Formwork, 10 ... Vibration device, ... Air spring . 12...Frame, 5

Claims (1)

[Scope of utility model registration request] A rubber-like elastic body 3 is fixed to the upper end of a pedestal 2 that can be raised and lowered by a fluid cylinder 1, and a plain pallet 4 is placed thereon, and a formwork 5 with vibration devices 10 provided on both sides is placed thereon. At the same time, the formwork 5 is pressed down from above by an air spring 15 attached to the frame 12 in a vibration device for a concrete block punching machine, and a plain pallet is mounted on the pedestal 2 together with the rubber-like elastic body 3. 4
A concrete characterized in that an air spring 15' that directly supports the lower surface is attached, and the upper air spring 15 and the lower air spring 15' are each connected to an air pressure supply pipe that allows air pressure to be controlled separately. Vibration device for block-powered machines.